Tube for ring spinning frame and apparatus for connecting a yarn end to said tube



cs. c. VAN DEN BERG ETAL 3,103,779 TUBE FOR RING SPINNING FRAME ANDAPPARATUS FOR CONNECTING- A YARN END TO SAID TUBE Filed June 27, 1962Sept. 17, 1963 6 FIG.1

JNVENTORJ G C. van aZew Berg United States Patent TUBE FOR RING SPINNINGFRAME AND APPA- RATUS FDR CONNECTING A YARN END T0 SAID TUBE GiisbertusC. van den Berg, Groenlo, and Hendrik Glastra, Enschede, Netherlands;said van den Berg assignor to said Glastra Filed June 27, 1962, Ser. No.205,635 Claims priority, application Netherlands July 13, 1961 3 Claims.((11. 57106) The invention relates to tubes for ring spinning frames,the term spinning frame being meant also to comprise other frames forthe production of yarn, such as doubling and twining frames, whichcomprise a rotating spindle onto which yarn is wound while beingtwisted.

A known problem connected with ring spinning frames is that ofrestarting the spinning process after dofling, that is to say after afull tube on a spindle has been replaced by an empty one, for the yarnend coming from the drawing rollers must be connected to the tube on thespindle in such a way that it does not get loose again when the spindlestarts rotating.

it is common practice to meet the problem by laying a couple of windingsof the yearn on the spindle beneath the tube before the full tube isremoved from the spindle. These windings are pulled upwards on thespindle when the tube is being removed, and are clamped between thespindle and the empty tube when the latter is pushed onto the first.

The drawbacks of this system are obvious. Pieces of yarn remaining onthe spindles make it diliicult to push the tubes on and pull them offthe spindles, and may even prevent them from being brought down to theircorrect positions.

It is an object of the invention to provide a tube for ring spinningframes that offers the possibility of restarting the spinning processwithout any yarn being wound on the spindle.

For this purpose, a tube according to the invention is provided with abrush-like top end, consisting of a number of thin, flexible pins whichare axially directed and placed closely together, so that a thread oryarn, laid on them and pushed or pulled between them, will be heldsufiiciently fast for starting the spinning process. On the other handthe yarn end will easily come loose when the yarn on the tube is woundoff by a winding machine.

The invention further relates to a device for connecting a yarn end tothe above-described tube on a ring spinning frame equipped with anautomatic or semi-automatic doiiing apparatus, for instance the combinedspinning and winding machine described in our co-pending application,Serial No. 205,636, filed June 27, 1962.

This device comprises a thread cutter of the type that can cut the yarnbetween the traveler and the doffed tube and can hold one yarn end, ahingingly mounted arm bent in a V, means for operating said cutter andmeans for moving said arm downwards when the device is moved towards thespinning spindle.

The invention will be further illustrated with the help of theaccompanying drawing. In this drawing:

FIG. 1 shows a tube according to the invention;

FIG. 2 shows a perspective view of a device for conmeeting a yarn end tothe tube of FIG. 1;

FIG. 3 shows a detail of the device of FIG. 2.

The tube 2, which is placed on a partly shown spindle 1, is provided atits top end with a metal reinforcement 3, on which a plate-shapedelement is fixed by means of a cylindrical connecting piece 4 having asmaller diameter. The recess thus formed between the reinforcement 3 andthe element 5 can co-operate with a forked gripper of a dottingapparatus not shown and not forming part of the invention.

The element 5 is provided with a number of pins 6 which are preferablymade of elastic material, for example synthetic high polymers, and forma kind of brush.

Before the spinning process is started with an empty tube on thespindle, the yarn end is laid between the pins 6. The pins 6 are soclose together that they exercise sufiicient friction on the yarn end tohold it when the spindle star-ts rotating. As soon as there are a fewwindings of yarn on the spindle, the yarn end is fixed so tightly thatthe yarn breaks when an attempt is made to pull it loose.

Laying the yarn end between the pins 6 can be done by hand and means aconsiderable saving of time with re spect to the usual method of windingthe yarn a couple of times around the spindle before the tube is put on.This operation is so simple that it can easily be performedautomatically or semi-automatically by means of a device that is of acheap and uncomplicated construction.

This device is shown in FIGURES 2 and 3. It is built in a case 7, whichis provided at its upper side with a yarn guiding groove 8. The bottomside is formed by a gripper 9 which is slidable transversely to thedirection of the yarn 10. The yarn 10 is situated between the travellerbelow and the full tube that is taken upwards oif the spindle.

In the case 7 is mounted a cutter which consists of a knife 11 and ablock 12 of elastic material, wherein a recess 13 is provided. Thecutter further comprises a clamping element 14, co-operating with a rib15 on the upper side of the block 12, and a clamping element 16,co-operating with the fiat underside 17 of the block 12. The block 12 isfixed to an operating rod 18, which can operate a number of cutterssimultaneously.

When the block 12 is moved towards the knife 11, the thread 3 is atfirst clamped between the clamping element 16 and the flat underside 17of the block 12, as also between the rib 15 and the clamping element 14.After this the knife 11 cuts the thread; when block 12 moves stillfurther the rib 15 gets clear of the clamping element 14; then thethread end which leads to the doffed tube, is loosed. The other end,however, is still being held between the element 16 and the underside 17of the block 12. Now when an empty tube 2 has been placed on thespindle, the device is moved towards it and encompasses it with therecess formed in the gripper 9. Hereby the gripper 9 is pushed backagainst the action of a spring 19, whereby at a determined moment theupstanding pin 21} pushed against the finger 21 0f the arm 23 which ishingingly mounted on the axis 22 and is bent into a V, into the bottompart of which the yarn 10 is pulled by the top of the tube 2. By theaction of the pin 20 the arm 23 is moved towards the top of the tube; atthe same time the block 12 is moved back so that the clamped yarn endcomes loose and is laid between the pins 6 by the movement of the arm23, which pins 6 then hold the yarn end. Then the device is moved back,the arm 23 is moved upwards by the action of a spring 24 and thespinning process can be started.

For each spindle of the spinning frame a device as described above ispresent. 'It is, therefore, of advantage that the device according tothe invention comprises only a few parts which, in addition to this,need not comply with narrow tolerances. Therefore, the device heredescribed is rather cheap to construct, which is a great advantageconsidering the number required.

We claim:

1. A tube for a ring spinning frame, having a substantially flat topend, a number of axially directed flexible pins provided on the top end,said pins being sufliciently close together for a yarn end laid betweenthem to be held during the beginning of the spinning process.

2. An apparatus for connecting a yarn end to the top of a tube accordingto claim 1, comprising a cutter of the type that can hold one of theyarn ends after the yarn 5 has been cut, means for operating saidcutter, a hinging arm having a V-shaped end, and means for swinging saidarm down on the top of the tube when the apparatus is moved towards thetube.

3. An apparatus according to claim 2, at the bottom 10 4 side of which asliding element is provided, said sliding element being meant tocooperate with the top end of the tube when the apparatus is movedtowards the tube, the movement of the hinging arm being derived from themovement of said sliding element.

References Cited in the file of this patent UNITED STATES PATENTS1,683,436 Barbour Sept. 4, 1928

1. A TUBE FOR A RING SPINNING FRAME, HAVING A SUBSTANTIALLY FLAT TOPEND, A NUMBER OF AXIALLY DIRECTED FLEXIBLE PINS PROVIDED ON THE TOP END,SAID PINS BEING SUFFICIENTLY CLOSE TOGETHER FOR A YARN END LAID BETWEENTHEM TO BE HELD DURING THE BEGINNING OF THE SPINNING PROCESS.
 2. ANAPPARATUS FOR CONNECTING A YARN END TO THE TOP OF A TUBE ACCORDING TOCLAIM 1, COMPRISING A CUTTER OF THE TYPE THAT CAN HOLD ONE OF THE YARNENDS AFTER THE YARN HAS BEEN CUT, MEANS FOR OPERATING SAID CUTTER, AHINGING ARM HAVING A V-SHAPED END, AND MEANS FOR SWINGING SAID ARM DOWNON THE TOP OF THE TUBE WHEN THE APPARATUS IS MOVED TOWARDS THE TUBE.